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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd127999bab0bd224f2472d3e8354fe4b17bd8191c7aa7ee6d31f81f594b616fe' 
  AND token = 'WogrdvIqSRNeQAW9iwuCWSW7hC2s4pFwfLPpc5PUF2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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