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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db8ce1a27e1edd1d9714b4f2b3f1ff5c82affa0c147a111b2c5d6cf199a784f3' 
  AND token = 'E/3HqN0Uppu54tg02oJD/lsZqb4gy7pLSs+wLb/4bbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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