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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2619fc47cf0e28e67f3f4e74649dca0bbab3ec212444568ea35b59a4ff51e0d9' 
  AND token = 'agz5RlZnKVdYc4uA4GWNFQ2fX/utMpQMo+LrDH+d5zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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