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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba2a72c155bd11a8039a1be7b46ec845abbaa57159ffd24e25df9630707b3a0' 
  AND token = 'PD5+T5931mZnmx+5lvFyTxRj2Metu6ZKDv7RGtkWXZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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