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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce304690d701c646cb35d082c6ac5d918cb5dbb21258e0ec8f1224db961c5b5e' 
  AND token = 'vLpI5Rmiyx76PKgaY+4DxC+ozJM5TViRQL//6ELx7ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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