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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f8e9370872d40659bbfa21ef6f85300cf3e8a43dd320046f7d8274ab0f9ad67' 
  AND token = 'JN8Vg0IOF6fPMx9LxCDB1T4HJ7YW4VZSb0Bjtluxho4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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