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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff2906ec59a7f06d41b260a9bb91e98f8d4f9286f1089d89fcc008541e7e47cd' 
  AND token = 'vE7iLsg/xP/zjsrFr61s3mkh2yZxMR3a4Pgfc4Okyfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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