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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f39ccfe53bd2c4d6ebc47124feabadd29d62b4ef170215a6b349ae5a1a6a9f' 
  AND token = '7SYnOYZr2DdW3ye1FBaG6Hh2+HJOqsL2vP0bG1y7RIw=' 
  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"
    }
  }
}