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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '073c3e27283c01ddee7604884691e7b5f332aa7f68556a194dae18a93f639080' 
  AND token = 'MRLlb3sc9vXuvZqCzAGAJ6Maeh8OhH7M78YgFgoKvss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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