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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a044bef89586bec2406c059bd1cb215bb88b5d1ef62eacba73e70f262402fe32' 
  AND token = 'hPq3H7BzKc42ydvmaJJ2o0m9jdNQYGglc1ezqAxKJmo=' 
  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"
    }
  }
}