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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a96157bd38f1fa80b37099d95faf4b4b8955a43dc6e191568bebe3b4af2fa1' 
  AND token = 'dyGZCeuEeS9/PibkgF5KODyRmtv3ItnxUs8jXlgJZ9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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