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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7dc60ed59be6f6f97deab4d9cfc4cd02f689f4ebeceeeda6c1b70ce26b53c3' 
  AND token = 'X/ztId/LpDo9Mcg1MWYY9iq08cUQGK9Ypu162hP3MxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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