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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2fccedf4beebe84128f7106a50fa539a58fa5b2db1615b1c213f0a4bb28fc3' 
  AND token = 'qZ8xBCZiQ4ZZ7MTZsIcjUxZKen7zwfVEnaLlf1sFh7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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