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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f7c6b2596dff7de92c4bec87c2b44046d6ab7d806228491665ec25eb34e1b8' 
  AND token = '98nlxD8oDvukhUHNrJl2mrmNOXF+ShAf/Fu1MiQECeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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