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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7efcd51a67aaa135dc6f69221f3984f8bb85ea33f5dd36d4803b9706fd4bb1' 
  AND token = 'ABmckU3XmkWUUQT4l2NBpk+WMs56iBGYv/M2/ralXz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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