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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d6c965818b2252ef279aec6ae5d4899e98ec64b575b61d1d776df3c147d0d8' 
  AND token = 'VaNZP1O3dJOMyjuIvSAXfza2F1QQzaEyEXIFKGqnsd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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