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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44b64de90d55b849638874094965096d9471e43df199b99ade2cce86443859a6' 
  AND token = 'fk+nhrMqSHapLT906Fgr8h/eG9agzk/0wS5g6ASyL4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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