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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4484e38850561f2633fc449c74d9989a87291d69e6c86a89e9a013ed6e88d144' 
  AND token = 'qBJTLPfdCeGBYNdqMN7d0BnJfT0L9couJAcoNH08G3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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