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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0961e2d1d89a1429fb1a8b5225fe9905e73ae8cbb0369f3703c52069ad8dfe7d' 
  AND token = 'fG7gHpHt0mxSzfRnirHpcqV0ba2M0YB4bW90t79eops=' 
  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"
    }
  }
}