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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd3f98cdf799cbe00255d58065305e18baa10de70a1f31150468ae20ed02198' 
  AND token = '/AL+myNuiTwP2QAL2qv9Qrc3QWPqt9z3QJJO9uQI+8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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