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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7f6437a165e9391c7267711534d6eb9b950331e7734e179f1e4d7b8f0379d5' 
  AND token = '06OXXyKb4DAbh+rCfPPYEtxsw39FzayhsGJDWFSBrd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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