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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768c64a1d22e0e5f8681dba535bfef9b53bf7df70b9fe0c9b3b275193b8ac5f5' 
  AND token = 'JCgiR2735FYcIVhHzJnUo0FfgVWcDslC/4J+cW6gouU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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