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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7da91ef9e0530a10d8e438c02bfc30ee15187e6ed383e02a1fdc4730da08f0' 
  AND token = 'HMgU+lfjykYUv5tQydTlwuBcQ5KyRBJvShG/Sp57Qb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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