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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c761dfd35a538b275570e26de92f20e46bd72284a5989aea5d3d191061161fe2' 
  AND token = 'F0WtsEA7Z2cS0trYb1gaPV3zQ94TIPHev/uZ6UOihx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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