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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b450cbbb627dbc3a688b9dbe9b6b75993ea1164ec6c7ffb8e031bc245218120c' 
  AND token = 'YXBEX/MhNKLn+a75dWs/67HRtByar8R23uujdtH4iBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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