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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc49c03a1b59c53f941cdb695696c72390eebe61d66f2548ec00b94608656f1' 
  AND token = 'RXZ8L66nu7WSFNbXGsNt3cgVyulv/f4oAMAOLTO4Oo0=' 
  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"
    }
  }
}