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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa27b0daec3495a5655a6dc65327064da29461afde6b331725232edfa69ea0d2' 
  AND token = 'AGn+ozaXtFuDHCpGAKOIL1h8Lui++H0GYH9d96sBG7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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