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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc3cc2b943da30ca4a640ccdc6739cfa50a346877258a328e5aac2330ad5d6e' 
  AND token = 'cxI7vcxOhfGkX4WfEKySWzYGmXUVv3d433qDy21C5Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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