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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e213a7cc2dfb1a9f2be5f79c41e09c75d28bfd809ae43a96b0734ea60aa3875' 
  AND token = 'Ydqh0B6gFzMVu0MVpDQUDNo+jzmE95k9c2JxgBT4Eg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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