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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f09e3635d3c1e81481810734a83a9e23a50dcd18968341c6d735f7bb1dc06bc' 
  AND token = 'I/Tpzhc11QTK4ObxAnVRn4sOPthmCswy5OMOd4D11DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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