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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85270aa4b39a675ce9b60b5d5e3d8e024f2962ce8abb0d1980956da2d8dced8e' 
  AND token = 'V7GHEhOB/47AnceEQoaJPiI4pj3JPOLojoJSNEQiJCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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