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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffcf469760c0e2f7dbae2e46a9f6ebc95311eb3ab7b8d18886c77cd11799ce29' 
  AND token = '1pnmCmT6D05pNdJSQ8wFauxqy3vkjO/pw4fRnD8uqdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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