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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc35e42dfe830470d43dacaccce5e0ab5823bc946a89c15db0f0f022bf01ded8' 
  AND token = '/o+04hzFmivtg6h82vad4jvOlfcbAEZ6EJrWEM3g4iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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