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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa85d510bc887f7d235fe9eb41f6e87ee879d67137665583df9f0f6e88fcc28' 
  AND token = 'VLC7toCWJVzOFINJ8bS/Tn4d6NT0Az3OZcMocvn94zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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