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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6ce23fa176d62a3845f4c9f303e03c317a5f508cb4634c135cd1f7f2b1796d' 
  AND token = 'K6htMx8628H+EP3dwTegoB+vTA8ONo8BLev0U3DrXSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}