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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b69f80e781deb7b17fc49949d35711fe36d72fb2af4561d359c28688b5e12a5' 
  AND token = 'VwF7hW0YS7uE4BHYRM/pCM9EzYAWeEDFt4spYOLfI3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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