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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bcc9978340de71ced89ee439812075746c30da683c761ba0a78be4cf482a9a9' 
  AND token = 'jcWABbV2c3BOxt9p9XDQNy6ooqw7mNtipd6MO7L+zqg=' 
  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"
    }
  }
}