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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be3625475f96e75a1bc959082cc5a66b06aff0649a08daa46d195ed2dcc584e6' 
  AND token = 'Uy1dngrKvdir+waP0w/YrbPMGbudae2Hb6H/htvs1og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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