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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72c334f9d3584e8b484cdfde0f840f611968d5460f9a2bb17dae60b1f62af1d6' 
  AND token = '3vcW/2zHdSqO174uybUSbQWRJ8UZ1pOhasZ9Juoq8wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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