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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c51f597e5a609dcb9c5e6e92feff0f13b3ca14c254371dcc39179d9d1a8abbcc' 
  AND token = '6UV6rkQdwhVtHlx6wUYgdSDCwYSooRndVIzL5G3VKZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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