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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d0d2e99d9ab58e78ab19c3b0497be468e99eb71ddbf997d64dacee92c24a8e' 
  AND token = '/mD8eDNdZjojjF010Teqg2h4TWZIuC3AiPp8FQJ5TNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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