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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d9f6a9c3763ce133dfe95ad796f80133cb54747c9ebabbfa5e8de80d22a2fb' 
  AND token = 'df1HG8e+HqYNyhRMS13nKx+3xsX1awV6u2/32MbCKDg=' 
  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"
    }
  }
}