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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b00ff4ab0409e1325fe51906136d62363eee68e1dea4d93b0fb949c6907c5d65' 
  AND token = 'T6ZPqmBVGJ7BZU9SKKbI2lbctm5YyZY1Z9tULIpT3aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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