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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dcd27d3bfd5f7c2558116e7634788a5923e6af345ba37ad64ef232c82fa7903' 
  AND token = 'dcB+rLsQ2zA1RXCPZIGRAJdvnFddUC/jP5Hy3T8OHf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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