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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea8a885d92c91c64feb98c38515fa1aff36a43e431d38e6123b02d3a91b43032' 
  AND token = 'oQ1AA1ROJTKXHTdwWhzDC6ozbb71pMlm8vQ1f1wI63w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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