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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10cf4143b70fea6fed6569e98c682c07e0abbab7d1e46ffe0ca0a11f726f986e' 
  AND token = 'L3mvheV8+yuO6caYZJ1jjwjodlI8E7/CIn8p8wvE0Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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