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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057d8bd28f9696a36bbdc3d84444a5978c1a143f055771dda314ae8a50fa85f5' 
  AND token = 'uKPcSCIYhS9X4XgaRg7yU55LVSJoKsLP03TS6sQZ29A=' 
  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"
    }
  }
}