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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f408c73dde73b652c09dcbe40ba3d152ec41d9957437e7d6ba4cef550754d1c' 
  AND token = 'sZK+iBRTBL0p5prHi/eKKaUO0VI5YyJ3wA3cz7LTjeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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