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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5df2ef38f41838374da3cfe24c5595b2736c69af3d17084c250deca597751a' 
  AND token = 'c+lFTp2b7leNY3SaA1UsoKKR67hWnqYqUE6/fCsmlXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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