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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c34cad9786cda6be5f2e328f9058ebcd0848a809d414f8ada99219a2b1a2d04d' 
  AND token = 'jgJDARz3G5e0CiICgDQK12H5bZ7pSa7FC8ox1DTOzZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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