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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585f573912108d3f7388ce2d644435990eb6c801bad663cdc761d517cf5e0c6d' 
  AND token = 'w9NWQZBnE9y4WqzdevT+6fdpuy7j32EG8nFEUK4Yzg8=' 
  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"
    }
  }
}