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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca6913e92ca6cab1206f64e915a587b26d3b705076e33deb0a087348fb52e0ee' 
  AND token = 's2TeNMk3GXDOIFt8b2ldgx9p1o556nTAI365LQ764qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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