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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc29504adb61d33823503031844595985f0f83f6d09f77b585bbd41b1d39bc7' 
  AND token = 'Hs/Nx0sw9pq18RHDdR0OCDf2nFSC0zqBI/r4lPuLAmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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