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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56dc26d7cc97c1da8f448a5a25097da1e734ee30d20fd9434464d5e13759108f' 
  AND token = 'VhIFrqMl+dfG7vX8k48sYtVnNhhMFWf1m5x4qeTWJ6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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