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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5ee6dfde2ccc5cb0e2478fea5928ff87112b1f5ff7c283ef90a0e40a76a03f' 
  AND token = 'GMh2HBw61H/0bd3fF8B4zmNO0VSyoCokSDM5LQ3qi/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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