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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02bed92f9c409e5751dd15e00454c8944112965c4db0079ad56b5c3808fc2851' 
  AND token = '45h77/FUaVk6Stf3ZA6GrI166OuoxXyq0vc8UdxvvL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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