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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe8e4acd57113b7a43fbfc85a1923e1d7a7910f0b62e91258ba405d1ea475e3' 
  AND token = 'U5G2W0RFbm6KyRpm2KjdwdTt0HLn5zela3yn0JjMNqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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