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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81d2c7aa2d6c90d74f0119d657a7881f991819d3fb5f7e8fcbc33fd6864c2842' 
  AND token = 'YoIYu5gOO9Hy2eczoguNMoXfYSzy4waEnyD11vNprD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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