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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e3c3672979159039d21b39ce378ad0495bc42fffdb4b691f071237ae0b8ee0e' 
  AND token = 'Uco7BV2L1r52oDBju7o7Xqu1yiw/w8JlWvLfyvHBvNo=' 
  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"
    }
  }
}